A private owner established a plantation of a semi-arid hybrid of Paulownia Clone in vitro 112® near the village of Střelice u Brna in 2016. We split the plantation according to terrain micro-relief (into three expositions: South slope, Plain area and North slope) and according to the applied biotechnology of planting (into two parts: each with planting into 20 and 30 cm holes in diameter). We tested different winter protection techniques for above and belowground plant organs. The results suggest that plants inside the 30 cm holes survive and grow better than those inside the 20 cm ones, regardless of terrain micro-relief. On the other hand, plants inside the 20 cm holes survive and grow better on flat areas compared to the others. The most effective protection of the root system against frost during the wintertime seems to be simple soil covering. We have also recognized that bandage of non-woven fabric is the best protection for the above-ground parts of the plants. However, growing conditions in the Czech Republic (CR) are different to those in semi-arid climate for which researchers bred the Paulownia Clone in vitro 112®. It is possible to achieve well-growing and surviving Paulownia plants under growing conditions of the CR when appropriate biotechnology and continuous treatment are applied. Keywords: Paulownia Clone in vitro 112®, plantation, exposition, mortality, growth, protection against frost damage
In this paper we are interesting in mathematical description of reforestation system in Drahanska highlands, which can be found in the Czech Republic. We estimate parameters of revenue and cost functions predefined according to formulation of underlying optimal control problem. Data related to wood processing economy are available in limited form only, because companies do not present their costs and profits in regular way. To cover overall situation in forestry management we employ simulation techniques, which provide data suitable for regression. Finally, shape and coefficients of cost and revenue functions are discussed for particular species.
We focused on the ability of one-year-old and two-year-old plants of Paulownia Clon in vitro 112® to sprout and grow branches, and on their pruning for their best possible growth on a plantation in Střelice u Brna. Furthermore, we carried out pruning on selected parts that comprised: spring pruning; reduction in the angle between the stem axis and one new growing sprout; and year-long pruning. The sprouting capacity of Paulownia was high—up to 56% (one-year-old plants) and 50% (two-year-old plants). Branches grew on 34% of all one-year-old plants and on 57% of all two-year-old plants. The best possible spring pruning method seems to be the keeping of one stem sprout or one stump sprout for one-year-old plants and one stem sprout for two-year-old plants. The newly growing stem sprout should be formed by bandaging it to the stem, and, as a result of this, the angle between the stem and the sprout can be reduced to 20° in contrast to 50° when the sprout is not bandaged. Our results suggest that it is best to take off the lower ⅓ of the branches and leaves, which leads to faster height growth of the plant.
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